Improvement in machines for boring hubs



UNITED STATESl PATNT QFFiCE.

PETER sonUrrLnn, on CHICAGO, inninois.

IMPROVEMENT IN MAcHlNEs FoP. BORING HUBS.

Specication forming part of Letters Patent No. 47,576. dated May 2, 1865.

scription thereof, reference being had to the accompanying drawings, making a part of this specification, in whichl Figure l is an elevation of the front side of my machine. Fig. 2 is an end view of the machine. Fig. 3 is a vertical transverse section through Fig. 1 at the point indicated by red line no m. Fig. 4 is a plan view of the tool holding and adjusting devices. Fig. 5 shows these parts in working position.

Similar letters of reference indicate corresponding parts in the several figures.

My invention relates to that class of hubboring machinery in which the hub is rotated instead of the boring-tool, the latter being adjusted up to the work as the boring pro- -gresses ing it automatically or by hand at the pleasf ure of the operator, as will be hereinafter de-1 scribed.

My invention also consists in a contrivance for throwing the tool-carriage into and out of gear with a feeding-screw, for the purpose of feeding the tool up to the work with a slow movement, and then returning the tool with a fast movement, as will be hereinafter d escribed.

- My invention also consists in an adjustable stop in connection with said contrivance, for automatically throwing the carriage out of gear with the feeding-screw immediately the tool completes its work, as will be hereinafter described.

To enable others skilled in the art to make and use my invention, I will describe its construction and operation.

In the accompanying drawings, A represents the bed or floor upon which the improved hub-boring machinery is mounted. A is the frame upon which the main driving-shaft A2 has its be'arings,'to which latter thehubs which are to be bored are` clamped in any suitable manner. This driving-shaft A2 communicates a rotary motion to a horizontal shaft, A3,

which has its bearings under the bed A, as

shown in Fig. 1, and the shaft A3 transmits a rotary motion to a screw-shaft, B, which has its end bearings in projections a a on the front side of a horizontal bed, (l. This bed C is supportedupon a stationary table, G', and j' connected to this table bya vertical central pin, b, Figs. 3, 4, and 5, which constitutes a pivot-joint for allowing the bed Cto-be adjusted at any desired angle. `This bed (l can be fixed rigidly to the table C' by means of the setscrews b b', which pass through slots at the ends of said bed, as shown in Figs. 4 and 5.

D represents a longitudinally-movable carriage, which is mounted upon the bed C and connected to it by the interlocking beveled anges, as shown in Figs. 2 and 3. This carriage can be moved from one end of the bed` G to the other, as will be hereinafter described.

`E represents the tool-rest, carrying the tool F, and c is a clamping-screw, which` is used for securing the tool-rest rigidly to its carriage, when the boring-tool is properly adjusted. The tool-rest E is connected to the carriage D by means of a dovetail tenon extending transversely across this carriage and iitting into a corresponding groove formed in the tool-rest. The clamping-screw c passes up througha slot, c', in the carriage D, and when the nut on the upper end of said screw is loosened the tool-rest can be adjusted laterally by means of the screw-shaft d.

The boring-tool consists of a tapering shaft, e, formed on the end of a square shank, e', which latter ts into recesses in the pillows of therestE, as shown in Figs. Zand 3. A spi- G represents a bearing-block, which is se. cured to the bottom surface of the front overhanging edge of carriage D, as shown iu Figs. l and A portion 0f this block Gr projects over the screwshaft B, but should not come in contact with said shaft. A block, h, having a half female screw-thread cut in a groove formed in its upper surface, is fitted to work upand down beneath the screw shaft B, and

in a recess formed in the bearingblock G. This half-nuth is moved up or down by means af a toe-lever, i, which is secured on the outer end of a short shaft, j, having a small eccentric on its inner end adapted to work in a recess which is formed in the half-nut, as shown in Fig. 3. A weight, w, is suspended from one end of the lever t', for the purpose of pressing the half-nut h upward and in contact with the screwshaft B. By pressing on the toe of lever i, and thus raising the weight fw, the haltnut h will drop down sufficiently far to release itself from the screw-shaft B,

y thus throwing the carriageD out of gear with said shaft.

H represents a stop-arm, which is secured, by means of a set-screw passing through a slot, to the front side of the table C', as shown in Fig. l. rlhis stop-arm is adjustable, and it is set in such position at the commencement of the operation of boring that it will tilt theA .lever z and throw the carriage D out of gear with the screw-shaft B at the proper time tov .stop the advancing movement of the tool.

The toe of lever i is slightly curved, so that it may be moved so far back as to throw the short arm of this lever forward of the center thereof, and thus hold the weight fw in an elevated position during the return movement of the carriage. The carriage D is moved backward by means of a pinion, p, engaging with the teeth of a rack, fr, as shown iu Fig. 1. The pinion p is keyed on one end of a short shaft, s, which projects through the bearing-block G and receives a crank, s', on its outer end, and the rack r extends along the front side of the table C', beneath the feedshaft B.

The operation of my machine is as follows: A hub which it is desired to bore is secured to the arbor or driving shaft A2 in any suitable manner and properly centered-z'. e., the center of the hub should be coincident with that of the shaft to which it is secured. The bed C is properly adjusted to give the desired taper to the hole through the hub, and the tool set by means of the screw-shaft din a proper position to commence work. The length of the hub being known, the stop-arm His adjusted and set in such a position that it will trip the levert' and disenga ge the halfnut h from the screw-shaft B at the moment the cuiter on the end of the tool completesits work-i. e., passes through the hub. When the carriage D has advanced as far as desired, the operator moves this carriage back again very rapidly by means of the rack and pinion, as above described. The rack and pinion are always in gear, but the half-nut h is not unless it is pressed up against the screwshaft B by thev levert' and weight w acting upon the short axle j.

It desirable, a friction-brake may be applied to the hub-holder for retarding or stopping its motion at pleasure. Such a brake l have represented in Fig. 1.

Having thus describedl my invention, what I claim as new, and desire to secure by Letters Patent, is-Y 1. The employment, iu combination with a machine designed for boring taper eyes or holes in hubs, of a horizontal pivoted bed, C, or

its equivalent, substantially in the manner and for the purpose described.

2. The employment, in combination with a machine designed for boring taper holes or eyes in hubs, of a laterally-adj ustable carriage, E, and a longitudinally-movable carriage, D,

`and a pivoted bed, C, all constructed, applied,

and operating substantially as and for the purpose set forth.

3. The employment of a rack and pinion, 1^ p, in combination with a feeding-screw, B, and contrivances for throwing this screw into and `out of gear with the carriage D, substantially A as described.

4. The vertically-sliding half-nut h, toe-lever 1', weight w, shaft j, and feeding-screw B, in combination with the tool-carriage of a hubboring machine, substantially as described.

5,. 1n combination with the lever i and half. nut h, the adjustable stop H, substantially as described.

6. The boring-tool F,constructed with a cutter, f, spiral flange, and a shoulder-cutter, g, substantially as described.

PETER soHUTrLER.

Witnesses: v

F. W. MATTERN, C. C. HUBBARD. 

